Twin Bridges

From SMWiki

Twin Bridges is the 4th world from the original SMW. Both of the bridges have names, the small one is "Cheese Bridge" and the bigger one is "Butter Bridge". They're made up of two levels Cheese Bridge Area and Cookie Mountain, and three secret levels Butter Bridge 1 and 2, and Soda Lake, the third Star World Portal, and on the cliff top west of the bridges the fourth castle, Ludwig's castle awaits the Mario Bros. This is the smallest world in the game.